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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291085c979e5dd5cf72286c06190e4fbfa8188c4c7937aef8cb8d9dfd07ac4c5' 
  AND token = '42m12y1nm4RITne/u8OLNhlHknLUPESJAiOIrEcddYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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