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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a9fe8cc22afa5df3916ec462060f0d95f73050c88d007624970d58bc4b4803' 
  AND token = 'THgZ4vGnlTmIEAPU0N4VGSKc6Iig8e1ZP6GzGDi+27E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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