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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734c45303b001d8a9a8ab91b5832ed7283c03d95554175e643864d06199887db' 
  AND token = 'C17DH30q+/MZ5yvzQCMDoXl16w5+x2Qwx1QyHvm0NWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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