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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141480f2bbd417cc704898459c3136294f967615613c2948fafa2aeda05d5973' 
  AND token = '26j2ac6O2N3KrtHankyPrs6xiQPewPoC74oLnxYRRIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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