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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a94c35e36aa2690035ed64c880039a231e27021b29dcf0ca95ecb40d9a9e5d9' 
  AND token = 'OypYdXegAEyNVCYd/U8wuFV7/O45vmTLTz7NcqVPBHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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