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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dd4d53efb2910d79dbfe75dbaa8ee82ff8ec21faf7ae6be0f9d612a417cc16' 
  AND token = 'v5KvZ0imqbj1F6bi+s1hCYosUv9gcpqZIkhKsRYscM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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