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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7feb850297c0472c8b771c380be576b4b5c169893ff101536dbb5a86403f3e65' 
  AND token = '+D6M9vnublAkenLw15XqwdfsM/GpSCgX6qXry2wqI/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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