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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c69e2e12a310e9e66972505b505b6e1f4fd1300e20ae9a1631026148d4a478c' 
  AND token = 'nz6klu94sLH3FxWmUCYVWsqQXR5+Qd+OT42XH8c7o/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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