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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651db21094054f85c5c3bf262ad4830341cf6e97dc075794435d7a4fa76155f9' 
  AND token = 'GxNp77GIoJhmWbV6z4EIPYsIc2pQJavPb8yL5+Jw2mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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