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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab5df38ee66a3d82f19babd31faedb713afecc29e4c01e8b888b03530f9d2df' 
  AND token = 'OuESJGUENtxeTWdMof7hRRIwLFegnzTUKOwQ+VmHa58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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