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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b97377704696c745713de6a97e5b861326cbd11d01a86c2fa8b7c43c4d683a' 
  AND token = 'YIN6leL0nx/LH+cKrMpp5GO7lMTfKlZaDGXjfxpDEOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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