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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61535fa23c712b3f433ba5e2f6c5c6f883bf942d848972365e0b209ec46ef1d0' 
  AND token = 'URRQBjp8POG3xcHyzNjaEXVfO7iBMg+MLDCCB43i5p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}