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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c77dd97aa35e714a774b651ff7c3598f7c652c7b65dc6d7886c415608363dc' 
  AND token = 'wFEQZzweZ8G+zP4Fm+FeOZm+r3GftsgGU9Rv6bWFmw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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