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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc66706c367aac71c3781f8375918e57a8022c31c07e8a76aeab4d9790568d55' 
  AND token = 'GjlWxb9fszrCZrnQND7TjaySeekmh3ym5ZOqtElK92g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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