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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5bab21aa2f023577910506996f0078b30947b3facbfc74814a7e4cf7dcacde' 
  AND token = 'CmEw0Mvb1GPM9ClD5YW/h0GJceu3NLzflZ/eL4EbX4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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