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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22886e715d38ac3ab3fc9a11816a63436027ef4e3efb78b6b5aa14de484387c3' 
  AND token = 'lsFQrUEgzKVFhT46clmMlCNNNreX1/plsntO2oo72TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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