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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db3b4e0cdbe854babebca25923f1caab7c99d7d80a0978f462cd381d1ddac1e' 
  AND token = 'kpow3Tt3zRlCyuxL3ENwCq21m/mQwVL2/V82smgGLOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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