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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81690bbc7f4b3f5aa64c14cd0d3eb78a1c3d2d1f884e63b26efef3bedc5b88ef' 
  AND token = 'b74nq37WquOD0IOZQtWekLBgFJy9mxiZ2QygB+B/Sts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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