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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1114de8c8c13dbf1d84b8ed6efde31794ad16c5d7a313e4ec67f4ee3cca71c' 
  AND token = '1u4PxnTUmvnurAOPMK9Y1qUWgo4/28JqiZ+uvWVpW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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