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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2625be73f8e50f52485b6ca555809c43e2552d5c0830482630076870e6f744' 
  AND token = 'f/3kUI6YpBGjjtdCU+sEbjq5bdQsG2eJh/LCm3TTq1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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