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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1693fe984e2603d5e286feba2c6b2fe5aab020d9503035e4b23f9099779262c' 
  AND token = 'Beao3nrF5iVqqOQZBOaci4kkS60yvTNwmCj+pSm2rCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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