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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d032bfc189ab15d4772f3e632b5e9bdcc0ff1a2d4c8435a371e6d02f7b50f4' 
  AND token = 'D3Lb79c7XBHYQiSCv62y3O2qXjjlCh+jrCRRglIh2Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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