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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cf90baba28f73f28410e847c5c18ed4a115c63b16de6f2059ae4f74d2b40b5' 
  AND token = 'mzPm8Ur4HnkRoTbNH/nYggnJWoMrrPNSbkOItElHM4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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