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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a330590e7cd89f8f077298f14a89647e2f1fb59fe391deecf1f036dd0d6c180b' 
  AND token = '3ZnPaEPjl8G8Auc/Wd3SbCQvxUyYf21z/M/EFxRoN0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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