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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b746f03afbe0effe1c855e61834af49963e64d5200b959cec918a364fdc0a76' 
  AND token = 'H0ebo0zQk80LafmAbVGEH88E4bGQNTUShuXT3gEhuyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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