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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ba638a95d2e10da15d798a5b32960845f989b83cc5f4e6cd00ea77c177a420' 
  AND token = 'gjiRWIcZDplzbY+xcVJN8Ge3OSklb8YGFhlEDgnreF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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