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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0843a9db0351fe75b4a59349af2e25c24836e332bbdc5f765a5c357e485c1e6c' 
  AND token = 'BaNDYgpdcb9urLOh9kogyQLB6rIcbplZit8ycb0DglE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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