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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2943119d43a19fffe16bff473133bb27602a067f2e209ad61933e0b63dc188' 
  AND token = '3E9f99kapMkLpMvRkEfNAmQVFyM2Us20+cwmFw0EqIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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