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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d585efdeb3b8b498e0e172773f9a557d7b2dcb0d66994e7f522896a1ac413a7' 
  AND token = 'edC4kNFU013ZHy0Z8h1690oVWNDnVu/GpqUKe9VwFdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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