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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac55b0d77dca2ede7b09629abb329a9ec331edf00a3230c93dc52cfa02414da' 
  AND token = 'c8s92+zSTV22uprkktNUAL4qlxjO6IPunXU9AQoX364=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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