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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d46bb53cb8f2dfbb2eb3ace87f6b65f0a255ce04f0cf4e3118ad80f53b8eac' 
  AND token = 'C9i44X4S0U1oZWihlZIp3z7IUbswJcPj1D4vLoTjSuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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