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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce846008881c4d3523d9a403125503b006ec06aea27283b4ef69d6acebcbf38a' 
  AND token = 'CFecLhBfdfpzsvv0Y6ucs9we5r6X91H1SvLFL76PKkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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