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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cca424d4ce9597c59935680a292fe408d231f8f0d458d223cd4a4d8840fb396' 
  AND token = 'bY497WoVRSNSa3gAlEVQdxdpe6EbZ7ElD3bzyh2HC04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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