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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c5b82617fe95e6546b5fab8bb0f89ddea09a6fe5368d69f1ae409c7694f3f2' 
  AND token = '8jcKqHQ/cu4NvxLI4MNgDR8kDKIO9zq9S1eBgz25q7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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