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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd9607b0d9f2a4f2e28e2a4792824a942fb32c3b3ba112ba95bd767b2d936f5' 
  AND token = '01MCcAIQD3VgvusVsZ0BZzNByl0PyGHpyxdFAM6jdII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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