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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d16c86f09f77fbd25f911a7909bf6ff2cb99e6747f75094211cd936b9194dd' 
  AND token = 'M7nDI0daMDmhtkmni3r6ytSq1q2CRjNK5Prjwc3MHiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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