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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033f00aa3222c1dbf0202cd6f3eeaab00dcdf784c10bc56234c38a4119a52421' 
  AND token = 'X12gEXeYw5w+pZLW2OyBcvYrgIlv1HArWINuV8xVa24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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