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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb97c43d806820c8a1e8a582304cd3acda9dd3f04959d0f18de9f26c330b67a' 
  AND token = 'y4PLG4MwvDdfatqHiYw19IN6EtguwXqqOpWC3XmHOP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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