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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc95593bb41df6e1e75685ff2f53162a0baffad2821b17e51d6ff18f8506bcc' 
  AND token = '2yl1n01+hj6QwLWYUYRabBf9AsaZfSUnR0MX+BI6cr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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