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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bc014cfada060db6c05049438fdb0a1555e3c9a4e00c087c87a7743bf02307' 
  AND token = 'mjwB0TRt4WPHvTH1t88N3rqRRk/kNfMAAp7VwLZ//N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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