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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cef48762ebf0f4bdb68f2928d757eff1c700dc6c01000dc010e886822b4fab5' 
  AND token = 'Z2CvuNSJdUYqHQUsemi5x7dJkGFi5PVf6ykXbgOwXdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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