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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874d5be7f19e27856ed5c365cd2b4a039efaa77a47467467b178c7cd4e9ca8e5' 
  AND token = '4wdmyFWy9Q2I9rNdrALhBH1yNBR6xLZGLPqdrd9h2Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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