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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7b6e41fc5a38d9619de04f86564a263c0e47e2ac0f10308f2f17c2badf120a' 
  AND token = 'sbV3auydel5/sm2x3poo4RLFuxZv1cXSnSSxZdK+F9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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