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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebf4ef58a251bc0f102ffaaa15d2ff1034d565c8acd108fb124bf0a8c0abc5e' 
  AND token = 'kSBa2lL//x9Xanvi8Zdk4ERzzSqNnBv0DZThPAfn1wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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