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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdc96bf71b96538c39ac96f0d1a0dadac6a6e539b8bdc202eada9890454cf46' 
  AND token = 'SGXH9CbWnT5rnjZ2DHrQOiZX8yNPtcVR4TEXvIEG8m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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