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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f05683110e9c7581fec97b2a42e634a4afec68313ce15542a5cd4cb4b02ce8' 
  AND token = 'zzf3h1gDig8iCLEgaKsz3/o+0oxZK01oBcQNuVonJ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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