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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25018f80c79279d7a09017f92743024fe01fb7740b4f7fa75b9576af07177d32' 
  AND token = 'DEOhwjOWpRHtDZ4x6BQz0/uWpZmTpqD0HBHg80sLc94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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