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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6966a0ca3713a0b2be9e0a60b660b33d7f729c7c521558c0f6aae03a8b15a4f' 
  AND token = 'sheqqrGPDm6fam0BzmBfaUhocR7L9VpvNXW1Gae+JwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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