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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ce413e2a00f1d2c25d5bfa81885f6dcbce4f07be2fa9c611737a69e281468f' 
  AND token = 'ABiPzx+3Qy7OuxnCEu+dPNWm0wXv+RIcSvkeX0ogNfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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