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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9468c9594f11278d5d97585728c1cd3b3494743e162cd2963d79d38dc555c8' 
  AND token = 'KWw2W/Gak/Cbsm3YU2w5lQ3wFXwGTyLP+6D+XJhoETk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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