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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c489a869ec16e5678b73563027fef19f11062bfc9ee359b0d71dbaea074af7' 
  AND token = 'YSQ0U5+kOkqVL3mC4rQfShxjXSpPd+PkM4Sdr2oCbAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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