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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0d534975a18feb44d93e82396e938d80d7b4bc4c1c4a675982550144b2262a' 
  AND token = 'CLyyMs2B7SdnvL0bAQSxkYQTNjCjJIE3IANS6ibYsdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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