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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2693c9b988fa3d34dc44ce09ec63fffa26b9ab92eae7b402bb2f58431d4d6f0b' 
  AND token = 'jfCE0I0yORInexgvhZq82msYwS5NQhOvDs1uUlErUYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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