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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3827ff96267d9828b775c4c327b3e15e773f326d523003fda7f48e0dea0830' 
  AND token = '7Rqs1g8itwoiBjsfDUWc99y8DCz7jb3ukyZO0MbB1wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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