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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f66684c2383561c40bd1987dcca07258f8df7d79f2d1c0fa31bd370ff2b215' 
  AND token = 'SAxPYG84P5f+a33cP/Btcf/va0nHXdDRs8hMjnffRnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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