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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698ce068454fe3e2e123118a23b31f3632c5059810be7b1cd994e2c4c09aee46' 
  AND token = '7snexSlAT/dahd0R4psi0Ea8Y5itzJcrDYV0JF9L23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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