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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6923d91c0bf514f06716af1ccf56220f9a1285d09ed14b0d4c4ed1ac2170e0fd' 
  AND token = 'I5h4yeNBXJMnkt3wtrsS2lLTsHN5acJdvcf7B6CVytY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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