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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e76514382715f05e7ab848014b547a08959c41525feac9d18dac06f11f05c5' 
  AND token = 'VbWDi/cNn/L6MjVsQsL9SQmzhNR84YXdSiZDGCHLYJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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