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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a77e9634159bfc2d4162b29f8b80bddcf4d3339dd817f65ccedc41580ca8fa' 
  AND token = 'oocIEfZ+oAFQESN/Kg/FzBmDlwyxmS954Fa9MtrII0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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