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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47580cf79b3f9fd1930ceaba2b67247e119650876c1a91f9cb3659e0d9b7b58' 
  AND token = 'tflult92rkzRC/9rb6ZBegqEmMSb4KDawJswalE18pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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