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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5092c267b91497b76462615fdcfb2f873b011b42a79f07453e04ea698b08ee' 
  AND token = 'Er7dE/XlPA4AGhFAQSVo12HzQ4uSQyVhgGSJIwTnxkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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