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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbdb6f796d30d066a06e92465d8f2dd9d4ba2bfb64580170ebdbe757fd8b706' 
  AND token = 'm6Sob76irff6nivoKtxFMM+Evrgq/rftaLAGIlZJ5EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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