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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f601ecff09f7323b3707361ebaf9f27987d41ec03f8e95e784e3d6f07f28e2d' 
  AND token = 'f/LsIayhqZ2EFO0qNZqRJJpp09qROUOSCJBqaYJu/+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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