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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87a556832ee9a0b313f3b89b052e5c7ae749bfd7ef87c706dffe0a57671a6f0' 
  AND token = '1GTlxRnXvc926bvG+bzCx1oOj3B3K/T7ut8H64PEdUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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