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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb04ba88941a0ed9dd3ef6f1263e9dd827ff764050d6ebf00790223b0de1b4f' 
  AND token = '91mn1XH5y427V8UuayvGKnV3kihbfRlgkwmm+CT390Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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