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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6923cdffe67e12b93455e1e2f336b9c0b5fa899c6338497631a2d4bada94d8dd' 
  AND token = 'hiwZ1rogwjryr2XWLVzCYWHRM7oPaFm23oounj42V1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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